Introduction to Digital Mobile Radio (DMR) by John S
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DMR and Digital Voice Modes
DMR and Digital Voice Modes Presented by N7MOT – Lenny Gemar Amateur radio began with spark gap transmitters, evolving to Morse code and analog voice communications, all originally in the Low Frequency (LF) and High Frequency (HF) bands. Since those early days, many new modes, both analog and digital have been developed. These modes now span from the Very Low Frequencies (VLF) to the Extra High Frequencies (EHF). This presentation is designed to acquaint amateur radio operators with the Digital Mobile Radio or DMR format of digital audio communications, used primarily in the VHF and UHF bands. We’ll briefly discuss the other four Common Air Interface formats (CAI) before diving into the specifics of DMR. DMR and Digital Voice Modes – 8/14/2017 Page 1 of 20 DMR and Digital Voice Modes Digital Voice Modes used in Amateur Radio Interconnected Systems • DDD-D---StarStar ––– Digital Smart Technologies for Amateur Radio (FDMA) • WiresWires----X/SystemX/System Fusion --- Wide-coverage Internet Repeater Enhancement System (FDMA) • NXDN (IDAS/NEXEDGE) ––– Icom/Kenwood Collaboration (FDMA) • DMR ––– Digital Mobile Radio (TDMA 2-TS) • P25 (Phase 1) – Project 25 or APCO P25 (Phase 1 FDMA, Phase 2 TDMA 2-TS) • TETRA --- Terrestrial Trunked Radio, formerly known as Trans-European Trunked Radio (TDMA 4-TS) No known U.S./Canada amateur deployments. DMR and Digital Voice Modes – 8/14/2017 Page 2 of 20 DMR and Digital Voice Modes Digital Voice Modes used in Amateur Radio Interconnected Systems. Repeaters in service as reported by RepeaterBook.com on 8/14/2017 @ 12:00 PDT for the U.S. and Canada. -
How to Configure Radios for Use with Repeaters
Concept of How to Configure Your Handheld and Mobile Radio for Use on a Repeater System VA6RPL Peter LaGrandeur Calgary Amateur Radio Association 2015 Learning Conference Limitations of “Standalone” Radios such as Handhelds and Vehicle Mounted Mobiles. Short Range of Coverage Signal easily blocked by major obstacles such as mountains, valleys, urban infrastructure What is a “Repeater” Radio? A repeater is basically a two way radio that receives a signal on one frequency, and simultaneously retransmits it on another frequency. It can retransmit with much greater power than received, and can send over a much wider area. A good example is where users are scattered in various areas separated by mountains; if a repeater is situated on top of a central mountain, it can gather signals from surrounding valleys, and rebroadcast them to all surrounding valleys. Handy! From there, repeater stations can be “linked” together to connect a series of repeater radios, each in a different area. With this, every time a user transmits on his mobile or handheld, his call will be heard simultaneously over all the repeater transmitters. And, yes! Repeater stations can now be connected via the internet. This internet linking is called IRLP – Internet Relay Linking Project. For example, a repeater in Calgary can link, via the internet, with an IRLP repeater anywhere in the world. You can carry on a two way radio conversation with someone in a faraway land with the assistance of the internet. Locating of Repeater Stations The higher the better. Yes, there are even satellite repeaters for amateur radio. In places that afford the best coverage in as many directions as possible. -
The FCC Filing
Dr. Theodore S. Rappaport, PE PO BOX 888 Riner, Virginia 24149 [email protected] November 10, 2018 Commissioners Federal Communications Commission 445 12th Street, SW Washington, DC 20554 Dear FCC Commissioners: This is a notice of ex parte, based on email communication I had with the CTO of the FCC, Dr. Eric Burger, on November 8, 2018, his reply on November 10, 2018, and my reply on November 11, 2018. The email communication is centered around a posting that appeared on the FCC ECFS system on November 7, 2018, and is part of an ongoing proceeding at the FCC, NPRM 16-239, that I and thousands of others view as a direct threat to the national security interests of the United States, as well as being detrimental to the hobby of amateur (“ham”) radio. Public comments made in FCC’s NPRM 16-239, and in FCC proceedings RM-11708, RM-11759, and RM-11306 proposed by the American Radio Relay League, show the vast number of rule violations and national security threats that continue to go unaddressed by the FCC. Commenters such as me view the lack of FCC acknowledgement of these problems as jeopardizing the safety of US citizens. NPRM 16-239 attempts to remove a limit on the baud rate of High Frequency (HF) shortwave transmissions, without first addressing ongoing rule violations pertaining to proper usage of the amateur radio service, the use of obscured, private messaging which is forbidden in Part 97 rules and creates national security concerns, as well as other violations. If allowed, NPRM 16-239 would perpetuate the current violations, and would authorize obscured transmissions of unlimited bandwidth over the global airwaves, further increasing the danger to our national security, since these transmissions cannot be intercepted or eavesdropped by other amateur radio operators or the FCC. -
EFJ Catalog 2004
Sandown Wireless USA 2004 Catalog Mobiles VHF UHF 800 MHz ANALOG/DIGITAL MOBILE RADIO I APCO Project 25 Compatible – Trunked and Conventional5300 SERIES I SMARTNET® and SmartZone® I Analog FM I Encryption For over 80 years, EFJohnson has been at the forefront of the communi- cations industry. Our subscriber radios are used throughout the world by military, police, fire, paramedics, and homeland security profes- sionals. The 5300 Series Analog/ Digital Mobile Radio provides Project 25 Forward Compatibility is provided Field Programmable Capability compatibility along with SMARTNET®/ via a scalable design that allows new provides National Telecommunications SmartZone® capability to meet the features and applications to be inte- and Information Administration (NTIA) needs of federal, state, and local grated into the existing radio platform. agencies the ability to reprogram government users, as well as business, conventional frequencies, CTCSS, DCS, Encrypted Communications for industrial and public safety applications. and talkgroups into the radio’s memory. Switching between SMARTNET/ wideband legacy systems and narrow- ™ 10-Character Alphanumeric Display SmartZone Project 25 and conventional band operation. DES and DES-XL provides a backlit visual display of the analog equipment is simple – just turn enable secure voice communications in radio’s channel or talkgroup on the front the channel knob. wideband channels; Project 25 DES-OFB and AES encryption provide secure of the radio. Tilt viewing angle allows Multiple Protocol Compatibility: communication in narrowband channels. for easy viewing anywhere in the – Project 25 CAI (Common Air vehicle and in any light condition. Interface) enables users to commu- Multiple System Select is an 100-Watt Option allows extra power nicate with other Project 25 compatible advanced feature that enables the user for VHF communication systems. -
Icom AV Retail Product & Price Catalog
U.S. Avionics Retail Product & Price Catalog October 2017 All stated specifications are subject to change without notice or obligation. All Icom radios meet or exceed FCC regulations limiting spurious emissions. © 2017 Icom America Inc. The Icom logo is a registered trademark of Icom Inc. The IDAS™ name and logo are trademarks of Icom Inc. All other trademarks remain the property of their respective owners. Contents Handhelds ............................................................................................................................................. 4 A14 .................................................................................................................................................... 5 A24 / A6 ............................................................................................................................................. 8 A25 .................................................................................................................................................. 11 Mobiles / Panel Mounts ........................................................................................................................ 13 A120 ................................................................................................................................................ 14 A220 ................................................................................................................................................ 17 Fixed Comms Infrastructure ................................................................................................................ -
NFARL Enews March 2013 Enews Is “What’S Happening” in North Fulton and Surrounding Area! Check out Each Item and Mark Your Calendar
NFARL eNEWS March 2013 www.nfarl.org eNEWS is “what’s happening” in North Fulton and surrounding area! Check out each item and mark your calendar. Go to arrl.org for national news, but here is this month’s North Fulton ARL eNEWS. Summary of Upcoming Events and Dates Every Wednesday – Hungry Hams Lunch Bunch – 11:15 AM – Slope’s BBQ, 34 East Crossville Road, Roswell Every Sunday – NFARES net – 8:30 PM – 147.06 MHz (PL 100) Every Monday – Tech Net – 8:30 PM – 145.47 MHz (PL 100) – Check NFARL Nets website for “how to” Second Tuesday – NFARES meeting – March 12, 7:00 PM – Brandon Hall School, 1701 Brandon Hall Drive, Sandy Springs Third Tuesday – NFARL club meeting – March 19, 7:30 PM – Alpharetta Adult Activity Center, 13450 Cogburn Road, Alpharetta. Kevin King, KC6OVD, will speak on Digital Mobile Radio (UHF/VHF) Mid-Month Madness – Johns Creek International Day – March 23, 1:00 PM to 4:00 PM, Northeast/Spruill Oaks Library, 9560 Spruill Road, Johns Creek. For more details, see Johns Creek International Day VE Testing Session – Saturday, March 9 – 10:00 AM – Alpharetta Adult Activity Center ________________________________________________________________________________________ Program Update / Joe Camilli, N7QPP At our March meeting, Kevin King, KC6OVD, (photo at left) will tell us about the exciting world of Digital Mobile Radio (DMR), a relatively new communications technology first introduced in Europe more than a decade ago and now in the United States. Among the benefits of DMR are improved spectrum efficiency (more signals in existing space!), more efficient use of equipment, greater system flexibility and more. -
Radio China Issue
Oberservation: 5G www.radiochina.info October-December 2019 Radio China 1 Oberservation: 5G Oberservation: 5G 海能达 2 October-December 2019 Radio China www.radiochina.info www.radiochina.info October-December 2019 Radio China 3 Oberservation: 5G Oberservation: 5G 海能达 2 October-December 2019 Radio China www.radiochina.info www.radiochina.info October-December 2019 Radio China 3 Oberservation:Contents 5G Oberservation: 5G Editor's Note Oberservation: 5G Mission Critical LTE Less of a Technical Thing 07 Prof. Shaoqian Li5G, New Opportunities for Private 22 Wireless Network Industry News Airbus Tests the World’s First Hybrid Tetra 5G 23 Network World’s 1st Test of Private Wireless Connected 08 Drones for Tsunami Evacuation Alert Qualcomm Overcoming 5G mmWave Challenges 24 Digital Inclusion: Driving Equal Access for All 09 GSMA: mmWave Bands Critical to Ultra-high Speed 24 Network Radio China Magazine and MCCResources Become 10 Strategic Partners Philippines National Police Launches Hytera DMR 11 Dialogue Trunking Communications System ETELM’s Take on Mission Critical LTE 26 25 Years of Impact on the World's Safety and Security 12 Will TETRA Survive? 27 Hytera PTC760 Wins "Best New LTE or Hybrid 14 Device" Award at ICCA Convergence & Evolution for a Safer World 28 More Countries Adopt Mission Critical Multi-mode 15 LTE Handsets Whitepaper Florida SARNET Receives Hytera Donation to Better 16 Prepare for Hurricane Season The Differences among MCS, VoLTE, PoC 30 Telecom Infrastructure Provider Launched Shared 17 Convergent Network Brand Guide TD -
Choosing a Ham Radio
Choosing a Ham Radio Your guide to selecting the right equipment Lead Author—Ward Silver, NØAX; Co-authors—Greg Widin, KØGW and David Haycock, KI6AWR • About This Publication • Types of Operation • VHF/UHF Equipment WHO NEEDS THIS PUBLICATION AND WHY? • HF Equipment Hello and welcome to this handy guide to selecting a radio. Choos- ing just one from the variety of radio models is a challenge! The • Manufacturer’s Directory good news is that most commercially manufactured Amateur Radio equipment performs the basics very well, so you shouldn’t be overly concerned about a “wrong” choice of brands or models. This guide is intended to help you make sense of common features and decide which are most important to you. We provide explanations and defini- tions, along with what a particular feature might mean to you on the air. This publication is aimed at the new Technician licensee ready to acquire a first radio, a licensee recently upgraded to General Class and wanting to explore HF, or someone getting back into ham radio after a period of inactivity. A technical background is not needed to understand the material. ABOUT THIS PUBLICATION After this introduction and a “Quick Start” guide, there are two main sections; one cov- ering gear for the VHF and UHF bands and one for HF band equipment. You’ll encounter a number of terms and abbreviations--watch for italicized words—so two glossaries are provided; one for the VHF/UHF section and one for the HF section. You’ll be comfortable with these terms by the time you’ve finished reading! We assume that you’ll be buying commercial equipment and accessories as new gear. -
ACCESSNET®-T – the Digital Mobile Radio System from Rohde & Schwarz
MOBILE RADIO TETRA radio systems ACCESSNET ®-T – the digital mobile radio system from Rohde & Schwarz On board from the start of organizations sharing an interest in topological restrictions. The system’s the promotion and implementation of suitability for multiprotocol applications R&S BICK Mobilfunk, the competence TETRA, which comprises more than 80 allows it to be used as a digital platform center for mobile radio communica- renowned companies today (information: for professional mobile radio networks tion in the Rohde & Schwarz group, col- www.tetramou.com). that must meet high availability require- laborated on the ETSI standardiza- ments. The high spectrum efficiency tion of TETRA – the best insurance that of the standard and the system ensure ACCESSNET®-T professional mobile ACCESSNET®-T: optimum utilization of the scarce fre- radio systems from Rohde & Schwarz unlimited scalability quency resources. conform fully to standard. Since 1995 the company has been a member of The network structure of the digital ACCESSNET®-T is extremely scalable – the Memorandum of Understand- mobile radio system ACCESSNET®-T is from a small network at a single com- ing (MoU), the European association non-hierarchichal and subject to no pany location all the way up to nation- wide networks. Mobile radio systems from Rohde & Schwarz can be expanded to suit one’s needs, no matter whether more voice capacity is needed or the network has to grow in size. Network nodes can be coupled with each other by means of digital fixed-network con- nections as well as by microwave link. ACCESSNET®-T is extremely scalable – from a small network at a single company location all the way up to nationwide networks. -
APX 6500 Single-Band P25 Mobile Radio
SINGLE-BANDAPX P25 MOBILE RADIO6500 STAY INFORMED. STAY SAFE. You may not know what the next call will entail, but you do know that Security is more important than ever. Criminals are testing you on your team needs communication they can count on. Whether on a the streets and over the air. Fight back with multiple levels of motorcycle, in a squad car or a fire truck, the rugged and compact design protection to encrypt and secure your voice and data communication of the evolved APX™ 6500 mobile radio is designed to maximize the real against eavesdropping. estate in your vehicle and keep your entire agency safely connected. Now Stay connected, keep safe and secure your communications with the with integrated Wi-Fi, Bluetooth and SmartConnect, the APX 6500 gives APX 6500 single-band mobile radio. you more ways to manage your radio and stay connected. And when your vehicle sustains a high impact, the radio can automatically alert dispatch. DATASHEET APX 6500 BUILT-IN ViQi VIRTUAL SMARTCONNECT Wi-Fi PARTNER GET CONNECTED AND STAY CONNECTED VOICE AND DATA, ALL AT ONCE FAST INFORMATION RETRIEVAL When the mission takes you out of range, Packed with all the connections you need, Running a routine database queries doesn’t you risk being left in the dark. The APX 6500, the APX 6500 keeps your team in touch need to slow you down. Simply press a button equipped with SmartConnect, can reroute P25 and within reach of over-the-air updates. on the keypad microphone and ask ViQi for the voice and data communication over broadband Receive new codeplugs, firmware information you need. -
Licensed Mobile Radio Deployments Rose 4.5 Percent Globally in 2017
Publication date: 15 Oct 2018 Author: Ryan Darrand Senior Analyst II, Critical Communications Licensed mobile radio deployments rose 4.5 percent globally in 2017 Brought to you by Informa Tech Licensed mobile radio deployments rose 4.5 1 percent globally in 2017 Highlights . Global deployments of licensed mobile radio (LMR) increased by 4.5 percent in 2017. Within the LMR market, the number of TETRA deployments increased by 16 percent globally in 2017. The number of deployments of cost-optimized digital technology also increased 16 percent in 2017, reaching more than $1 billion in revenue. IHS Markit expects it will be the fastest-growing LMR technology over the next five years. APCO P25 continued its success in the North American market, up by 4.3 percent, while TETRAPOL continued to refresh networks around the world. Our analysis Licensed mobile radio (LMR) deployments continue to increase globally, despite the emergence of LTE solutions onto the world stage and 5G on the horizon. Government and commercial sectors increasingly rely on LMR for secure, instant and reliable voice communications, so cost-optimized digital technologies, TETRA, P25, TETRAPOL and other major digital LMR technologies continue to attract investment. Overall digitization continues in the industry, as the number of digital users exceeded the number of analog users for the first time in 2017. However, there are a significant number of analog users who have not yet converted to digital-radio protocols. The global success of digital technologies has been multifaceted, as multi-tiered options, greater competition and advances in capabilities have provided an increasingly cost- effective migration path from analog to digital communications. -
Letter from the MARC President This Will Also Be an Opportunity to Bring in Your QSL Cards So That We Can Submit Them to the ARRL Bureau
Next Meeting: Apr 16, 2013 at 7:30 PM Mar/Apr 2013 Letter from the MARC President This will also be an opportunity to bring in your QSL cards so that we can submit them to the ARRL bureau. We did this at the September meeting and we plan to continue doing this twice a year. As part of your club dues, MARC will pay the postage and fees for the card submission. Remember to bring your ARRL membership number. · Our May meeting is ‘home brew’ night – that’s radio – not beer!! Tom Freeman (K3TF) will be showing us his home brew VFO and we’ll have time for other presentations as well – what have you made that you would like to share with the club? · Our next VE test session is May 4 – please contact Bob Lees (W3ZQN) if you would like to sign up to upgrade. Remember that one of the benefits of MARC membership is one free test session per year. · Field Day is June 22/23. This will also be our club picnic – a new feature. Steve Ikler (KS3K) - that’s Steve’s new Extra Call - will be our Field Day Captain, again and Yak (N3MQM) will be in charge of food. Thanks to Steve and Yak for making this happen but they are going to need lots of help Dear Fellow MARC Members: with set up, operating, making food and tak e down. Please let us know how you can help. I hope you are all enjoying 2013, which already seems to be slipping by – hard to believe it’s already the end of March.